Reduction of Eddy-Current Losses in Fractional-Slot Concentrated-Winding Synchronous PM Machines

• Published in: IEEE transactions on magnetics Vol. 52; no. 7; pp. 1 - 4
• Main Authors: Choi, Gilsu, Jahns, Thomas M.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-07-2016; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Coils (windings); Core loss; Eddy current testing; Eddy-current loss reduction; Flux; fractional-slot concentrated windings; Harmonic analysis; Magnetic cores; Magnetic flux; Magnetism; magnetomotive force (MMF) harmonics; Mathematical analysis; permanent magnet machines; Permanent magnets; Power capacitors; Power harmonic filters; Rotors; Synchronous; Windings; fractional-slot concentrated windings (FSCWs); permanent magnet (PM) machines; Eddy-current loss reduction; magnetomotive force (MMF) harmonics
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2016.2517144

This paper presents the results of an investigation focused on the rotor eddy-current losses of a permanent magnet (PM) synchronous machine that is equipped with fractional-slot concentrated windings (FSCWs). Major spatial harmonics that induce the most significant rotor eddy-current losses are identified and evaluated. Time-stepped finite-element analysis results are presented to compare the predicted losses in the proposed FSCW-PM machine designs. It is shown that the lowest total eddy-current losses in the rotor core and magnets are achieved by introducing flux barriers into the rotor back iron along the d -axis.